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RE: Rotary spark gaps



Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jim-at-jlproduction-dot-com>

Ill give you guys a hint on balance that we use for crankshaft wheels at
work. If you already know this then please disregard. If a wheel is
suspended by its center point(like a bike wheel by its forks for
example)
The heavy spot will always point down. Take a drill and drill small
holes, or even semi thru dimples, at the heavy spot until the wheel
remains motionless regardless of the position it is put in.
This gets us close enough to spin a 200 lb wheel that are 5 ft dia at
high rpm with no vibration.
Hope this helped,
Jim

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com] 
Sent: Monday, March 25, 2002 2:22 PM
To: tesla-at-pupman-dot-com
Subject: Re: Rotary spark gaps

Original poster: "rheidlebaugh by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

Just a thought. At 6ooo rpm an electrode will fly off the rotor like a
bullet if it gets loose. I wouldnt touch that one...Safety first
   Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Sun, 24 Mar 2002 22:11:02 -0700
> To: tesla-at-pupman-dot-com
> Subject: Rotary spark gaps
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Sun, 24 Mar 2002 22:17:47 -0700
> 
> Original poster: "makinglightning comcast by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <makinglightning-at-comcast-dot-net>
> 
> I am building a rotary spark gap and was wondering which of 2
directions
> that I should go.
> 
> I have a 1hp 24vdc permanent magnet motor with a 1/2" x 11" wheel with
14
> electrodes that I have not mounted yet, which spins up to 2000 rpm
(rated).
> That would give me 460 bps.
> 
> I also have a 1.5 hp 90vdc pm motor that spins up to 6700 rpm (rated).
I was
> thinking of a .187" x 7" that I am about to route, with 6 electrodes.
That
> would give me up to 600 bps.
> 
> I will vary both of these with a variac.
> 
> I am not sure which way I should head in. I know that maybe I might
have
> balancing problems with the faster one? It would be a smaller package
though
> and would not require a transformer. But maybe 460bps might be just
fine
> with the slower motor? Would the faster one run cooler maybe? What
power
> levels could I go up to with brass bolts? I have heard that they would
be
> less likely to melt down than other types of bolts. Maybe I won't need
> tungsten carbide in the wheel, less work, easier to balance. Should my
> stationary electrodes be very big brass bolts or 3/8" carbide bits?
Are
> there any plusses and minuses to these two motor approaches that I am
not
> thinking of?
> 
> If anyone wants to give me their 2 cents on any of this, I would
greatly
> appreciate it.
> 
> Kevin
> 
> 
>